21252561551134 has 8 divisors (see below), whose sum is σ = 31879230360768. Its totient is φ = 10626151430880.

The previous prime is 21252561551129. The next prime is 21252561551201. The reversal of 21252561551134 is 43115516525212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64466827 + ... + 64795654.

It is an arithmetic number, because the mean of its divisors is an integer number (3984903795096).

Almost surely, 2^{21252561551134} is an apocalyptic number.

21252561551134 is a deficient number, since it is larger than the sum of its proper divisors (10626668809634).

21252561551134 is a wasteful number, since it uses less digits than its factorization.

21252561551134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129344690.

The product of its digits is 360000, while the sum is 43.

The spelling of 21252561551134 in words is "twenty-one trillion, two hundred fifty-two billion, five hundred sixty-one million, five hundred fifty-one thousand, one hundred thirty-four".